/**
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.swifty.toptoastbar.curve;

import ohos.agp.animation.Animator;

/**
 * An interpolator where the change bounces at the end.
 */
public class BounceInterpolator implements Animator.TimelineCurve {

    private static double bounce(double t) {
        return t * t * 8.0;
    }

    @Override
    public float getCurvedTime(float t) {
        // _b(t) = t * t * 8
        // bs(t) = _b(t) for t < 0.3535
        // bs(t) = _b(t - 0.54719) + 0.7 for t < 0.7408
        // bs(t) = _b(t - 0.8526) + 0.9 for t < 0.9644
        // bs(t) = _b(t - 1.0435) + 0.95 for t <= 1.0
        // b(t) = bs(t * 1.1226)
        t *= 1.1226f;
        if (t < 0.3535f) return (float) bounce(t);
        else if (t < 0.7408f) return (float) (bounce(t - 0.54719) + 0.7);
        else if (t < 0.9644f) return (float) (bounce(t - 0.8526) + 0.9);
        else return (float) (bounce(t - 1.0435) + 0.95);
    }
}
